›_ Codex Issues
Codex Issues / #2376

GPT-5 does not support 'Concise' Reasoning Summaries

Resolved 💬 7 comments Opened Aug 16, 2025 by ChakibHi Closed Nov 28, 2025

What version of Codex is running?

codex-cli 0.22.0

Which model were you using?

gpt-5

What platform is your computer?

Microsoft Windows NT 10.0.26100.0 x64

What steps can reproduce the bug?

Setting up in the config.toml file the model_reasoning_summary = "concise" for GPT-5 model, e.g.:

```config.toml
model = "gpt-5"
model_reasoning_summary = "concise"


### What is the expected behavior?

Concise summaries

### What do you see instead?

```terminal
🖐 unexpected status 400 Bad Request: {
  "error": {
    "message": "Unsupported value: 'concise' is not supported with the 'gpt-5-2025-08-07' model. Supported values are: 'detailed'.",
    "type": "invalid_request_error",
    "param": "reasoning.summary",
    "code": "unsupported_value"
  }                                                                                                                                                                                                                                                  
}

Additional information

_No response_

View original on GitHub ↗

7 Comments

faroukcharkas · 10 months ago

Any update on this? Seems to be an issue with GPT-5

adamallcock · 10 months ago

+1

LeonardoMeireles55 · 9 months ago

<img width="387" height="110" alt="Image" src="https://github.com/user-attachments/assets/39b1d6a7-b198-4f71-b9c5-936913dec1d2" />

<img width="425" height="97" alt="Image" src="https://github.com/user-attachments/assets/564ab975-d77d-47e9-b6af-23ebf06c4f4b" />

• WSL2/Debian/VSCode

🧠 Model
• CLI Version: 0.41.0

⚠️ stream error: unexpected status 400 Bad Request: {
"error": {
"message": "Unsupported value: 'concise' is not supported with the 'gpt-5-codex' model. Supported values are: 'detailed'.",
"type": "invalid_request_error",
"param": "reasoning.summary",
"code": "unsupported_value"
}

adamallcock · 9 months ago
<img alt="Image" width="387" height="110" src="https://private-user-images.githubusercontent.com/123477726/493896016-39b1d6a7-b198-4f71-b9c5-936913dec1d2.png?jwt=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpc3MiOiJnaXRodWIuY29tIiwiYXVkIjoicmF3LmdpdGh1YnVzZXJjb250ZW50LmNvbSIsImtleSI6ImtleTUiLCJleHAiOjE3NTg4MTE5MzEsIm5iZiI6MTc1ODgxMTYzMSwicGF0aCI6Ii8xMjM0Nzc3MjYvNDkzODk2MDE2LTM5YjFkNmE3LWIxOTgtNGY3MS1iOWM1LTkzNjkxM2RlYzFkMi5wbmc_WC1BbXotQWxnb3JpdGhtPUFXUzQtSE1BQy1TSEEyNTYmWC1BbXotQ3JlZGVudGlhbD1BS0lBVkNPRFlMU0E1M1BRSzRaQSUyRjIwMjUwOTI1JTJGdXMtZWFzdC0xJTJGczMlMkZhd3M0X3JlcXVlc3QmWC1BbXotRGF0ZT0yMDI1MDkyNVQxNDQ3MTFaJlgtQW16LUV4cGlyZXM9MzAwJlgtQW16LVNpZ25hdHVyZT0xNGFlMTA5MTE2ZTcxOThhNzYyZTA4OGI2NTRkYzczYTUxY2ZkYTk3OWRjMDNlZTdlYTY3ZmU5M2FlYjZkZWM1JlgtQW16LVNpZ25lZEhlYWRlcnM9aG9zdCJ9.Cfq50KSkhhmgS1kINWRbu--erSJpQ0bmfoyAD6Z0fn4"> <img alt="Image" width="425" height="97" src="https://private-user-images.githubusercontent.com/123477726/493896106-564ab975-d77d-47e9-b6af-23ebf06c4f4b.png?jwt=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpc3MiOiJnaXRodWIuY29tIiwiYXVkIjoicmF3LmdpdGh1YnVzZXJjb250ZW50LmNvbSIsImtleSI6ImtleTUiLCJleHAiOjE3NTg4MTE5MzEsIm5iZiI6MTc1ODgxMTYzMSwicGF0aCI6Ii8xMjM0Nzc3MjYvNDkzODk2MTA2LTU2NGFiOTc1LWQ3N2QtNDdlOS1iNmFmLTIzZWJmMDZjNGY0Yi5wbmc_WC1BbXotQWxnb3JpdGhtPUFXUzQtSE1BQy1TSEEyNTYmWC1BbXotQ3JlZGVudGlhbD1BS0lBVkNPRFlMU0E1M1BRSzRaQSUyRjIwMjUwOTI1JTJGdXMtZWFzdC0xJTJGczMlMkZhd3M0X3JlcXVlc3QmWC1BbXotRGF0ZT0yMDI1MDkyNVQxNDQ3MTFaJlgtQW16LUV4cGlyZXM9MzAwJlgtQW16LVNpZ25hdHVyZT1iNDVkNmZjMzY3NDM2N2E3YzAwNTdlYjMxYmM2YzQzMWRhN2NjYTAwN2Q4Y2ZlMjE0ZDBjNzVlOGYxZmI4MWQ0JlgtQW16LVNpZ25lZEhlYWRlcnM9aG9zdCJ9.jiVZdZuTZY5CAV79QswVG3KHsGsHnzkQltsrFfQVc04"> • WSL2/Debian/VSCode 🧠 Model • CLI Version: 0.41.0 ⚠️ stream error: unexpected status 400 Bad Request: { "error": { "message": "Unsupported value: 'concise' is not supported with the 'gpt-5-codex' model. Supported values are: 'detailed'.", "type": "invalid_request_error", "param": "reasoning.summary", "code": "unsupported_value" }

Confirmed still not working

{
    "model": "gpt-5",
    "input": "Tell me a three sentence bedtime story about a unicorn.",
 "reasoning": {
      "effort": "low",
      "summary":"concise"
    }}
{
    "error": {
        "message": "Unsupported value: 'concise' is not supported with the 'gpt-5-2025-08-07' model. Supported values are: 'detailed'.",
        "type": "invalid_request_error",
        "param": "reasoning.summary",
        "code": "unsupported_value"
    }
}
sebastian-montero · 9 months ago

still not working

ohcedar · 8 months ago

+1.
"auto" == "detailed" right now so I get these silly long summaries for very simple tasks and decisions. I asked it to change a number to a roman numeral and the reasoning summary was 4 paragraphs long.

kirso · 8 months ago

Seems like its not clear from the docs what are all available values:

unexpected status 400 Bad Request: {
  "error": {
    "message": "Unsupported value: 'concise' is not supported with the 'gpt-5-2025-08-07' model. Supported values are: 'detailed'.",
    "type": "invalid_request_error",
    "param": "reasoning.summary",
    "code": "unsupported_value"
  }
}